On 4/14/21 4:38 PM, Mario wrote:
> Maybe I am just too short in D, but I wanted to find out if it is possible to create classes dynamically. My problem is, I just don't know where to start reading. Maybe at mixin templates?
> 
> CreateClassWithName!("MyDynamicClassName");
> 
> should create the following class to work with dynamically:
> 
> class MyDynamicClassName {
>     this() { writeln("I was not written, but still I exist!"); }
> }
> 
> So that I in the end by means of
> 
> MyDynamicClassName cls = new MyDynamicClassName;
> 
> can work with it.
> 
> Normally I would think of a macro first, but as far as I understood D doesn't know macros (which I'm not really sad about), but maybe I'm just thinking too complicated yet. I would appreciate any hints, because as I said, I don't even know where to start reading.
> 

There is no good supported way to do this with the current runtime.

The way this is normally done is to use your own reflection system, and build a mechanism to create classes based on their name.

There was an old way, using Object.factory, but I would not recommend that, it's brittle and doesn't always work.

-Steve

On Wednesday, 14 April 2021 at 20:47:57 UTC, Steven Schveighoffer wrote:
> There is no good supported way to do this with the current runtime.
>
> The way this is normally done is to use your own reflection system, and build a mechanism to create classes based on their name.
>
> There was an old way, using Object.factory, but I would not recommend that, it's brittle and doesn't always work.
>
> -Steve

Too bad. Nevertheless, thank you for your quick answer to my question.

-Mario

On 4/14/21 1:38 PM, Mario wrote:

> Maybe I am just too short in D, but I wanted to find out if it is
> possible to create classes dynamically.

In D world, "dynamically" means "at run time".

> Maybe at mixin templates?

Both mixins and templates are compile time features.

> Normally I would think of a macro first

If we are talking about C (and C++) macros, they are compile time features as well.

So, I think you want help from D to generate types, which can happen only at compile time with statically-typed languages like D. And yes, D is a great language for "generative programming" like that.

> "I was not written, but still I exist!"

Not possible by this "programming language", which wants a source code written, by a human or a machine, to be compiled. Still, anything is possible: For example, you can generate source code, dispatch a compiler, and load dynamically at run time. :)

Ali